Unit 4 I used to be afraid of the dark.句子分析Mario,you used to be short,didn’t you?马里奥，你以前很矮，是吗？（1）used to后跟动词原形，表示“过去做某事”，只表示过去和现在的对比，暗指现在已经不存在的动作或状态。 否定形式： didn’t use to do sth. / used not to do sth. He used to play football after school. 放学后他过去踢足球。 Did he use to play football? Yes, I did. No, I didn’t. He didn’t use to smoke. 他过去不吸烟。温馨提示：used to do sth.中的used没有人称和时态的变化。例1：---Wow! You look different! You_______wear glasses. ---Yes,I did.But now I am wearing contact lenses(隐形眼镜). A.could B.must C.used to D.would本句是一个反意疑问句。反义疑问句的特点是“前否后肯，前肯后否”，而且后半句在时态、人称或数上要与前半句相呼应。 回答反义疑问句和回答一般疑问句一样，肯定回答用“Yes,主语+肯定结构”；否定回答用“No,主语+否定结构”。 ①肯定述句＋否定提问 如：Lily is a student, isn’t she? Lily will go to China, won’t she? ②否定述句＋肯定提问 如：She doesn’t come from China, does she? You haven’t finished homework, have you? ③提问部分用代词而不用名词 Lily is a student, isn’t she? ④述句中含有否定意义的词，如：little, few, never, nothing, hardly等。其反意疑问句用肯定式。 如： He knows little English, does he? 他一点也不懂英语，不是吗？They hardly understood it, did they?他们几乎不明白，不是吗？例：1.---There are always many volunteers in |
